I have killed a lot of critters with them and still use them, but would not necessarily recommend them.
The stock outsert makes for a very weak spot behind the insert, and I have had multiple breaks on angled shots. Also not much surface area for glue ,so you can lose tips on targets, especially if shooting broadheads into certain materials. I switched to using the ethics archery insert/outsert and it works better, but a bunch more money and the inserts can still bend on an angled hit. Eventually I will either use day six if I want a skinny shaft or just use the vintage shafts, which work well.